AT90USB1287-64QFN datasheet(8/38 Pages) ATMEL

Part #	AT90USB1287-64QFN

Description	AT90USB1287 (AVR) 64 QFN device (2.7V < VCC < 5.5V)

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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AT88SCK109STK3

3-6

AT88CK109STK3 User Guide

8699A—CRYPTO—10/09

Figure 3.

AT88Microbase Components (back side)

3.2

Power Supply

3.2.1

USB powered

The on-board power supply circuitry allows two possible configurations for the main supply voltage.

Mounted Resistor

Main Board

Supply Voltage

Comments

R1

3.3V

R2

5.0V ( USB )

Default Setting

The CryptoCompanion supply voltage is always 3.3V, regardless of R1and R2 configuration.

5.0 ( USB )

3.3V

Regulator

CryptoCompanion

0

VCC

R2

R1

Main board

Supply Voltage

* Default

3.3V

16MHz

Crystal

AT88SC108

CryptoCompanion

AT90USB1287

AVR

Main board

Supply Voltage

*see section 3.2.1

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AT90USB1287-64QFN Datasheet(PDF) 8 Page - ATMEL Corporation

AT90USB1287-64QFN Datasheet(HTML) 8 Page - ATMEL Corporation

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